Using std::search to search substrings in a std::string

Question

I want to search in a string some substrings using std::search.

I tried this:

std::string str = "the quick brown fox jumps over the lazy dog";
std::string substr[] = { "fox","dog","bear" };
auto it = std::search(str.begin(), str.end(), substr, substr + 3);
std::cout << "substring found at position :" << (it - str.begin()) << std::endl;

And I have these errors :

operator_surrogate_func:no mathing overloaded function found
Failed to specialize function template 'unknown type std::equal_to<void>::operator()

Answer 1

You have an array of substrings so you need to compare each one individually, std::search can only look for one substring at a time.

std::string str = "the quick brown fox jumps over the lazy dog";
std::string substr[] = { "fox","dog","bear" };

for(auto& sstr : substr){
    auto it = std::search(str.begin(), str.end(), sstr.begin(), sstr.end());
    std::cout << "substring found at position :" << (it - str.begin()) << std::endl;
}

Note that if the substring is not found the return will be the .end() iterator which points to one past the end of the string.